Question

我在_initializeData中有一个新创建的json数据模型。目的是当用户尝试删除购物车中的物品时，我想将该物品存储在此新数据模型中。因此，在单击删除按钮时，我正在读取具有购物车中所有项目的json数据模型，然后使用已删除元素的索引将结果复制到新模型中。如果我仅删除一项，它会正常工作。但是，如果我在另一个项目上按“删除”，则新模型将覆盖新模型中的上一个条目。它不像数组那样保存所有条目。

_initializeData: function () {
        var removedData = {};  // new model for removed parts
        removedData.removedParts = [];
        this.removedItems = new JSONModel(removedData);
        this.getView().setModel(this.removedItems, "removedItems");
 }

// button click
onRemovePart: function (oEvent) {  
        var idx = this.getView().byId("table").getSelectedIndex();

        // retrieveing the model which has all the parts from the table 
        var data = this.getView().getModel("materialData").getProperty("/partsData");

        // reading the removed item data 
        var removedPart = data[idx];

        // assigning it to the new model. But it does not hold multiple 
        entries rather over-writes the previous one
        this.getView().getModel("removedItems").setProperty("/removedParts", removedPart);

Answer 1

使用inline避免引用。在这里，引用引起了压倒性的行为

Answer 2

问题在于您要覆盖模型上的完整对象：removeItems。

由于您将其覆盖，所以旧数据将丢失。因此，您所需要做的就是获取已删除的旧项目数组，将元素推入其中，然后将其设置为模型。

   _initializeData: function () {
        var removedData = {};  // new model for removed parts
        removedData.removedParts = [];
        this.removedItems = new JSONModel(removedData);
        this.getView().setModel(this.removedItems, "removedItems");
 }

// button click
onRemovePart: function (oEvent) {  
        var idx = this.getView().byId("table").getSelectedIndex();

        // retrieveing the model which has all the parts from the table 
        var data = this.getView().getModel("materialData").getProperty("/partsData");

        // reading the removed item data 
        var removedPart = data[idx];

        // assigning it to the new model. But it does not hold multiple 
        entries rather over-writes the previous one
        // Get the old deleted items first :
        var oDeletedItems = this.getView().getModel("removedItems").getProperty("/removedParts");
        oDeletedItems.removedParts.push(removedPart); // the array is removedParts and oDeletedItems is the obejct which stores the array as per _initlaise method
        this.getView().getModel("removedItems").setProperty("/removedParts", oDeletedItems);

希望这会有所帮助。

将数组结果从一个json对象移动到另一个

2 个答案: